Complex interstellar absorption lines of C_2_ in the Cygnus OB association

Details Complex interstellar absorption lines of C_2_ in the Cygnus OB association Complex interstellar absorption lines of C_2_ in the Cygnus OB association

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...285..640g&link_type=abstract

Astronomy and Astrophysics 285, 640-644 (1994)

Astronomy and Astrophysics

Astrophysics

18

Interstellar Medium: Abundances, Interstellar Medium: Molecules, Associations: Cyg Ob 2

Scientific paper

Measurements of interstellar absorption lines in the (1,0) band of the C_2_ Phillips system, around 1.015 μm, are reported for the stars Nos. 12 and 5 of the Cyg OB2 association. The R(0), Q(2), and Q(4) lines, at a resolving power of 65,000, show a complex structure, with four discrete components in No. 12 and three in No. 5. The radial velocities of the various components, spread over a range of 22 km/s , agree in both stars, suggesting their origin in similar spatio-kinematic structures. The relative intensities between the various components are not the same in the two stars, but the net C_2_ column densities derived for the two stars result nearly proportional to their respective B-V color excesses, as it has been found in stars of smaller reddening. A typical clump of absorbing gas, in the close neighborhood or within the association, has been characterized by an upper limit of 5 pc in linear dimensions and a mass of 200 Msun_. The low emission of the association in the free-free radio continuum is suggested to be a result of the removal of HII-gas by the powerful winds known to be emitted by its members.

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